Also known as screw fasteners, not the same name and himself, but the inner meaning is the same. When each of the fasteners to the two or more parts (or components) fastening become a whole adopted a kind of mechanical parts in general. Fastener product standards should involve some aspects of content. 1, fastener product dimensions Standards: specify the content of the basic dimensions of the product; the product threaded stainless steel self-tapping screws, including basic thread size, thread ending, shoulder distance, undercuts and chamfers, outer The end of the size threaded parts and other aspects. 2, the fastener product technology standard conditions. Including content production tolerances, mechanical properties, surface defects, surface treatment, product testing standard terms and the corresponding specified areas. Qingdao 321 stainless steel bolts stainless steel self-tapping screws, 316 stainless steel flat pad, 316 stainless steel expansion bolt 304 stainless steel locking screw 5. short foot length is not less than the standard length minimum length Tai'an stainless steel self-tapping screws, but the call is not less than the minimum allowed length short feet. For example Laiwu stainless steel self-tapping screws, water, gas delivery pipe specified in the standard, allowing each batch of 10% (calculated according to the number) 2-4m long short-foot pipe. 4m length limit is not the length of the shortest allowable length is 2m. Sunshine stainless steel self-tapping screws, Jinan Road ground (online consultation), stainless steel self-tapping screws provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) Shandong Jinan, hardware accessories leader over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Daoqin better future.